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Sensors

Sensirion

SignalQuest     more

 

  • Humidity and Temperature Sensors
  • Differential Pressure Sensors
  • Liquid Flow Sensors
  • Mass Flow Meters for Gases
  • Mass Flow Controllers for Gases

 



Sensirion is a leading sensor manufacturer, providing relative humidity sensors and flow sensor solutions with unique performance. Together with our capacitive humidity sensor, the product range includes liquid flow sensors, mass flow meters, mass flow controllers and differential pressure sensors. Using our microsensor solutions, OEM customers benefit from the proven CMOSens® Technology and excellent technical support. Among a large variety of applications, the flow and humidity sensors are successfully used in the automotive and medical industry.

Sensirion Company Portrait

 


Product Range

Humidity & Temperature Sensors

SignalQuest Components

Differential Pressure Sensors

SignalQuest Components

Liquid Flow Sensors

SignalQuest Components

Mass Flow Meters for Gases

SignalQuest Rugged Package

Mass Flow Controllers for Gases

SignalQuest Rugged Package

 


Humidity and Temperature Sensors

Humidity sensors from Sensirion with CMOSens®

   
Feuchtesensoren mit CMOSens

Capacitive humidity sensor principle

In addition to the resistive method, the capacitive measurement principle, above all, established and proved itself as a standard in the past. For this principle, the sensor element is built out of a capacitor. The dielectric is a polymer which absorbs or releases water proportional to the relative environmental humidity, and thus changes the capacitance of the capacitor. This change in capacitance can be measured by an electronic circuit. This allows the relative air humidity to be determined. For humidity sensors with CMOSens® technology, a "micro-machined" finger electrode system with different protective and polymer cover layers forms the capacitance for the sensor chip, and, in addition to providing the sensor property, simultaneously protects the sensor from interference in ways previously not achieved.

 

Humidity, temperature and dew point

The temperature sensor and the humidity sensor together form a single unit. This also enables an accurate and point-precise determination of the dew point, without incurring errors due to temperature gradients between the humidity and the temperature sensors. Through the unique linkage of these sensor elements with the signal amplifier unit, the analog-to-digital converter, the calibration data memory, as well as the digital, bus-ready interface, all on a surface area of a few square millimeters.

Highest stability and performance

Total coverage with condensation or even immersion in liquid present no problems whatsoever. Over two years of hardness tests have already shown this result. The signal amplification near the sensor allows the polymer layers to be optimized not for the signal strengths, but rather for long-term stability, which is significant for numerous applications. The analog-to-digital conversion, which is also performed "in place," makes the signal extremely insensitive to noise. A checksum generated by the chip itself is used for additional reliability. Last but not least, the calibration data loaded on the sensor chip guarantees that Sensirion humidity sensors have identical specifications and thus they can be replaced 100%. Other obvious advantages are the very short response times (4 sec at 1/e), high precision (±2% to ±5% according to configuration), as well as very low power consumption (< 3mA standby).

Digital Interface

Humidity and temperature sensors with CMOSens® technology can be connected directly to any microprocessor system by means of the digital 2-wire interface, which minimizes the system development times, saves costs, and leads to a significant advantage, especially for high-volume applications.